$ python -m venv .virtualenv
$ ./ve pip install -r requirements.txt
$ ./ve python server.py -h
usage: server.py [-h] [--host HOST] [--port PORT] --prefix PREFIX
optional arguments:
-h, --help show this help message and exit
--host HOST
--port PORT
--prefix PREFIX Allowed directories
$ ./ve python server.py --host 127.0.0.1 --port 8765 --prefix /tmp/dir1/ --prefix /tmp/dir2/